Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1963_148_5_a4, author = {A. A. Dezin}, title = {The simplest solvable extensions of ultrahyperbolic and pseudoparabolic operators}, journal = {Doklady Akademii Nauk}, pages = {1013--1016}, publisher = {mathdoc}, volume = {148}, number = {5}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_5_a4/} }
A. A. Dezin. The simplest solvable extensions of ultrahyperbolic and pseudoparabolic operators. Doklady Akademii Nauk, Tome 148 (1963) no. 5, pp. 1013-1016. http://geodesic.mathdoc.fr/item/DAN_1963_148_5_a4/